Hobart 6921 Series Operation And Maintenance Manual page 104

OM-2040 / Operation and Maintenance Manual
90D20 / Generator Sets
Engine and Controls (cont.)
Trouble, Symptom & Condition
Engine will not start. Starter
will not crank engine
(continued).
2. Engine will not start. Cranking
speed low.
3. Engine will not start. Cranking
speed normal.
Chapter 3-1
Page 12
Test or Inspection
g. Internal seizure
a. Low battery output or faulty
starter.
b. Loose starting circuit
connections or faulty cables.
c. Improper lubricating oil
viscosity.
a. No fuel.
b. Low compression which
may be caused by any of
the following:
c. Sticking or burned exhaust
valves .
d. Compression rings worn or
broken.
e. Cylinder head gasket
leaking.
Corrective Action
If all engine starting components
are good and the starter is
unable to crank the engine,
internal seizure is indicated.
Attempt to hand-crank the
engine, using a socket wrench
with long flex handle on the
crank shaft pulley screw. If the
engine cannot be turned a
complete revolution, remove
engine and disassemble to find
damage and cause.
Check battery and starter.
Recharge, repair, or replace.
Check all connections and
cables. Tighten or replace as
required.
Check oil. See Sect. 2-1, Para.
3, D, (3).
Before attempting to find the
cause of "no fuel", prime the
fuel filters by removing pipe
plug in the cover of each. Fill
each filter with fuel oil. If the
engine will not start after
priming, mechanical pump
trouble is indicated. If the
engine starts and then stops
after a short time, trouble
between the fuel source and
the suction side of the pump is
indicated. Check and/or remedy
as follows (see Fig. 7).
Check compression in
accordance with Para. 9, C and
D.
Cylinder head must be removed
and overhauled to correct this
condition.
Check rings in accordance with
Para. 9, E, (1).
Check gasket in accordance
with Para. 9, E, (2).
February 28/94 Revised